FFmpeg
eamad.c
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1 /*
2  * Electronic Arts Madcow Video Decoder
3  * Copyright (c) 2007-2009 Peter Ross
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Electronic Arts Madcow Video Decoder
25  * @author Peter Ross <pross@xvid.org>
26  *
27  * @see technical details at
28  * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_MAD
29  */
30 
31 #include "libavutil/mem_internal.h"
32 
33 #include "avcodec.h"
34 #include "blockdsp.h"
35 #include "bytestream.h"
36 #include "bswapdsp.h"
37 #include "codec_internal.h"
38 #include "get_bits.h"
39 #include "aandcttab.h"
40 #include "eaidct.h"
41 #include "idctdsp.h"
42 #include "internal.h"
43 #include "mpeg12data.h"
44 #include "mpeg12vlc.h"
45 
46 #define EA_PREAMBLE_SIZE 8
47 #define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD I-frame */
48 #define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD P-frame */
49 #define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
50 
51 typedef struct MadContext {
59  unsigned int bitstream_buf_size;
60  DECLARE_ALIGNED(32, int16_t, block)[64];
62  uint16_t quant_matrix[64];
63  int mb_x;
64  int mb_y;
65 } MadContext;
66 
68 {
69  MadContext *s = avctx->priv_data;
70  s->avctx = avctx;
71  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
72  ff_blockdsp_init(&s->bdsp, avctx);
73  ff_bswapdsp_init(&s->bbdsp);
74  ff_idctdsp_init(&s->idsp, avctx);
75  ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE);
76  ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct);
78 
79  s->last_frame = av_frame_alloc();
80  if (!s->last_frame)
81  return AVERROR(ENOMEM);
82 
83  return 0;
84 }
85 
86 static inline void comp(unsigned char *dst, ptrdiff_t dst_stride,
87  unsigned char *src, ptrdiff_t src_stride, int add)
88 {
89  int j, i;
90  for (j=0; j<8; j++)
91  for (i=0; i<8; i++)
92  dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
93 }
94 
95 static inline void comp_block(MadContext *t, AVFrame *frame,
96  int mb_x, int mb_y,
97  int j, int mv_x, int mv_y, int add)
98 {
99  if (j < 4) {
100  unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x;
101  if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7)
102  return;
103  comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
104  frame->linesize[0],
105  t->last_frame->data[0] + offset,
106  t->last_frame->linesize[0], add);
107  } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
108  int index = j - 3;
109  unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2);
110  if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7)
111  return;
112  comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
113  frame->linesize[index],
114  t->last_frame->data[index] + offset,
115  t->last_frame->linesize[index], add);
116  }
117 }
118 
119 static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block,
120  int mb_x, int mb_y, int j)
121 {
122  if (j < 4) {
124  frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
125  frame->linesize[0], block);
126  } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
127  int index = j - 3;
129  frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8,
130  frame->linesize[index], block);
131  }
132 }
133 
134 static inline int decode_block_intra(MadContext *s, int16_t * block)
135 {
136  int level, i, j, run;
137  RLTable *rl = &ff_rl_mpeg1;
138  const uint8_t *scantable = s->scantable.permutated;
139  int16_t *quant_matrix = s->quant_matrix;
140 
141  block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];
142 
143  /* The RL decoder is derived from mpeg1_decode_block_intra;
144  Escaped level and run values a decoded differently */
145  i = 0;
146  {
147  OPEN_READER(re, &s->gb);
148  /* now quantify & encode AC coefficients */
149  for (;;) {
150  UPDATE_CACHE(re, &s->gb);
151  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
152 
153  if (level == 127) {
154  break;
155  } else if (level != 0) {
156  i += run;
157  if (i > 63) {
158  av_log(s->avctx, AV_LOG_ERROR,
159  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
160  return -1;
161  }
162  j = scantable[i];
163  level = (level*quant_matrix[j]) >> 4;
164  level = (level-1)|1;
165  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
166  LAST_SKIP_BITS(re, &s->gb, 1);
167  } else {
168  /* escape */
169  UPDATE_CACHE(re, &s->gb);
170  level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
171 
172  UPDATE_CACHE(re, &s->gb);
173  run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
174 
175  i += run;
176  if (i > 63) {
177  av_log(s->avctx, AV_LOG_ERROR,
178  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
179  return -1;
180  }
181  j = scantable[i];
182  if (level < 0) {
183  level = -level;
184  level = (level*quant_matrix[j]) >> 4;
185  level = (level-1)|1;
186  level = -level;
187  } else {
188  level = (level*quant_matrix[j]) >> 4;
189  level = (level-1)|1;
190  }
191  }
192 
193  block[j] = level;
194  }
195  CLOSE_READER(re, &s->gb);
196  }
197  return 0;
198 }
199 
201 {
202  int value = 0;
203  if (get_bits1(gb)) {
204  if (get_bits1(gb))
205  value = -17;
206  value += get_bits(gb, 4) + 1;
207  }
208  return value;
209 }
210 
211 static int decode_mb(MadContext *s, AVFrame *frame, int inter)
212 {
213  int mv_map = 0;
214  int av_uninit(mv_x), av_uninit(mv_y);
215  int j;
216 
217  if (inter) {
218  int v = decode210(&s->gb);
219  if (v < 2) {
220  mv_map = v ? get_bits(&s->gb, 6) : 63;
221  mv_x = decode_motion(&s->gb);
222  mv_y = decode_motion(&s->gb);
223  }
224  }
225 
226  for (j=0; j<6; j++) {
227  if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map
228  int add = 2*decode_motion(&s->gb);
229  if (s->last_frame->data[0])
230  comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
231  } else {
232  s->bdsp.clear_block(s->block);
233  if(decode_block_intra(s, s->block) < 0)
234  return -1;
235  idct_put(s, frame, s->block, s->mb_x, s->mb_y, j);
236  }
237  }
238  return 0;
239 }
240 
241 static void calc_quant_matrix(MadContext *s, int qscale)
242 {
243  int i;
244 
245  s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
246  for (i=1; i<64; i++)
247  s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
248 }
249 
251  int *got_frame, AVPacket *avpkt)
252 {
253  const uint8_t *buf = avpkt->data;
254  int buf_size = avpkt->size;
255  MadContext *s = avctx->priv_data;
256  GetByteContext gb;
257  int width, height;
258  int chunk_type;
259  int inter, ret;
260 
261  bytestream2_init(&gb, buf, buf_size);
262 
263  chunk_type = bytestream2_get_le32(&gb);
264  inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
265  bytestream2_skip(&gb, 10);
266 
267  av_reduce(&avctx->framerate.den, &avctx->framerate.num,
268  bytestream2_get_le16(&gb), 1000, 1<<30);
269 
270  width = bytestream2_get_le16(&gb);
271  height = bytestream2_get_le16(&gb);
272  bytestream2_skip(&gb, 1);
273  calc_quant_matrix(s, bytestream2_get_byte(&gb));
274  bytestream2_skip(&gb, 2);
275 
276  if (bytestream2_get_bytes_left(&gb) < 2) {
277  av_log(avctx, AV_LOG_ERROR, "Input data too small\n");
278  return AVERROR_INVALIDDATA;
279  }
280 
281  if (width < 16 || height < 16) {
282  av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n");
283  return AVERROR_INVALIDDATA;
284  }
285 
286  if (avctx->width != width || avctx->height != height) {
287  av_frame_unref(s->last_frame);
288  if((width * (int64_t)height)/2048*7 > bytestream2_get_bytes_left(&gb))
289  return AVERROR_INVALIDDATA;
290  if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
291  return ret;
292  }
293 
294  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
295  return ret;
296 
297  if (inter && !s->last_frame->data[0]) {
298  av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
299  ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF);
300  if (ret < 0)
301  return ret;
302  memset(s->last_frame->data[0], 0, s->last_frame->height *
303  s->last_frame->linesize[0]);
304  memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 *
305  s->last_frame->linesize[1]);
306  memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 *
307  s->last_frame->linesize[2]);
308  }
309 
310  av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size,
312  if (!s->bitstream_buf)
313  return AVERROR(ENOMEM);
314  s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)),
315  bytestream2_get_bytes_left(&gb) / 2);
316  memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, AV_INPUT_BUFFER_PADDING_SIZE);
317  init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb)));
318 
319  for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
320  for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
321  if(decode_mb(s, frame, inter) < 0)
322  return AVERROR_INVALIDDATA;
323 
324  *got_frame = 1;
325 
326  if (chunk_type != MADe_TAG) {
327  av_frame_unref(s->last_frame);
328  if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
329  return ret;
330  }
331 
332  return buf_size;
333 }
334 
336 {
337  MadContext *t = avctx->priv_data;
339  av_freep(&t->bitstream_buf);
340  return 0;
341 }
342 
344  .p.name = "eamad",
345  .p.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video"),
346  .p.type = AVMEDIA_TYPE_VIDEO,
347  .p.id = AV_CODEC_ID_MAD,
348  .priv_data_size = sizeof(MadContext),
349  .init = decode_init,
350  .close = decode_end,
352  .p.capabilities = AV_CODEC_CAP_DR1,
353 };
bswapdsp.h
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
level
uint8_t level
Definition: svq3.c:206
blockdsp.h
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
mem_internal.h
comp
static void comp(unsigned char *dst, ptrdiff_t dst_stride, unsigned char *src, ptrdiff_t src_stride, int add)
Definition: eamad.c:86
GetByteContext
Definition: bytestream.h:33
MadContext::bitstream_buf_size
unsigned int bitstream_buf_size
Definition: eamad.c:59
decode_mb
static int decode_mb(MadContext *s, AVFrame *frame, int inter)
Definition: eamad.c:211
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:116
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:374
FFCodec
Definition: codec_internal.h:118
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:178
BlockDSPContext
Definition: blockdsp.h:34
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:649
ff_idctdsp_init
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:240
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:346
init
static int init
Definition: av_tx.c:47
AV_CODEC_ID_MAD
@ AV_CODEC_ID_MAD
Definition: codec_id.h:179
AVCodecContext::framerate
AVRational framerate
Definition: avcodec.h:1741
bytestream2_skip
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:122
MadContext::bdsp
BlockDSPContext bdsp
Definition: eamad.c:53
RLTable
RLTable.
Definition: rl.h:39
GetBitContext
Definition: get_bits.h:61
mpeg12vlc.h
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:478
MadContext::idsp
IDCTDSPContext idsp
Definition: eamad.c:55
ff_ea_idct_put_c
void ff_ea_idct_put_c(uint8_t *dest, ptrdiff_t linesize, int16_t *block)
Definition: eaidct.c:80
av_reduce
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
AVRational::num
int num
Numerator.
Definition: rational.h:59
MadContext
Definition: eamad.c:51
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:104
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
ff_rl_mpeg1
RLTable ff_rl_mpeg1
Definition: mpeg12data.c:166
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:149
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:260
s
#define s(width, name)
Definition: cbs_vp9.c:256
AV_GET_BUFFER_FLAG_REF
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:376
SHOW_SBITS
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:212
get_sbits
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:359
get_bits.h
SKIP_BITS
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:193
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
ff_bswapdsp_init
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
run
uint8_t run
Definition: svq3.c:205
aandcttab.h
MadContext::avctx
AVCodecContext * avctx
Definition: eamad.c:52
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
ff_eamad_decoder
const FFCodec ff_eamad_decoder
Definition: eamad.c:343
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:199
index
int index
Definition: gxfenc.c:89
bytestream2_get_bytes_left
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
bytestream2_tell
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:192
MADe_TAG
#define MADe_TAG
Definition: eamad.c:49
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1462
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AV_CODEC_FLAG_GRAY
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:259
AVPacket::size
int size
Definition: packet.h:375
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
calc_quant_matrix
static void calc_quant_matrix(MadContext *s, int qscale)
Definition: eamad.c:241
av_frame_ref
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:353
codec_internal.h
FF_IDCT_PERM_NONE
@ FF_IDCT_PERM_NONE
Definition: idctdsp.h:38
MadContext::scantable
ScanTable scantable
Definition: eamad.c:61
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: eamad.c:335
MadContext::block
int16_t block[64]
Definition: eamad.c:60
ff_mpeg1_default_intra_matrix
const uint16_t ff_mpeg1_default_intra_matrix[256]
Definition: mpeg12data.c:30
MadContext::bbdsp
BswapDSPContext bbdsp
Definition: eamad.c:54
OPEN_READER
#define OPEN_READER(name, gb)
Definition: get_bits.h:138
height
#define height
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:116
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
decode_block_intra
static int decode_block_intra(MadContext *s, int16_t *block)
Definition: eamad.c:134
MadContext::gb
GetBitContext gb
Definition: eamad.c:57
ff_init_scantable
av_cold void ff_init_scantable(const uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:30
MadContext::bitstream_buf
void * bitstream_buf
Definition: eamad.c:58
ff_mpeg12_init_vlcs
av_cold void ff_mpeg12_init_vlcs(void)
Definition: mpeg12.c:162
av_fast_padded_malloc
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:48
value
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value
Definition: writing_filters.txt:86
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:487
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:211
AVCodecContext::height
int height
Definition: avcodec.h:571
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:608
idctdsp.h
avcodec.h
GET_RL_VLC
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)
Definition: get_bits.h:728
ff_zigzag_direct
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
av_uninit
#define av_uninit(x)
Definition: attributes.h:154
ret
ret
Definition: filter_design.txt:187
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: eamad.c:67
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dvdec.c:133
ff_inv_aanscales
const uint16_t ff_inv_aanscales[64]
Definition: aandcttab.c:38
IDCTDSPContext
Definition: idctdsp.h:53
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
comp_block
static void comp_block(MadContext *t, AVFrame *frame, int mb_x, int mb_y, int j, int mv_x, int mv_y, int add)
Definition: eamad.c:95
mpeg12data.h
AVCodecContext
main external API structure.
Definition: avcodec.h:398
MadContext::last_frame
AVFrame * last_frame
Definition: eamad.c:56
MadContext::mb_y
int mb_y
Definition: eamad.c:64
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:211
AVRational::den
int den
Denominator.
Definition: rational.h:60
idct_put
static void idct_put(MadContext *t, AVFrame *frame, int16_t *block, int mb_x, int mb_y, int j)
Definition: eamad.c:119
MadContext::mb_x
int mb_x
Definition: eamad.c:63
MADm_TAG
#define MADm_TAG
Definition: eamad.c:48
decode210
static int decode210(GetBitContext *gb)
Definition: get_bits.h:831
av_clip_uint8
#define av_clip_uint8
Definition: common.h:101
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
add
static float add(float src0, float src1)
Definition: dnn_backend_native_layer_mathbinary.c:35
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:90
ff_init_scantable_permutation
av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation, enum idct_permutation_type perm_type)
Definition: idctdsp.c:51
ScanTable
Scantable.
Definition: idctdsp.h:31
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: eamad.c:250
decode_motion
static int decode_motion(GetBitContext *gb)
Definition: eamad.c:200
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:571
bytestream.h
eaidct.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:370
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
BswapDSPContext
Definition: bswapdsp.h:24
MadContext::quant_matrix
uint16_t quant_matrix[64]
Definition: eamad.c:62
ff_blockdsp_init
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:59
RLTable::rl_vlc
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
re
float re
Definition: fft.c:79